Messages in this thread | | | Date | Thu, 15 Apr 2010 12:34:55 -0400 | From | Chris Mason <> | Subject | Re: [PATCH 1/2] ipc semaphores: reduce ipc_lock contention in semtimedop |
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On Thu, Apr 15, 2010 at 06:33:13PM +0200, Manfred Spraul wrote: > On 04/14/2010 09:50 PM, Chris Mason wrote: > >On a big system I saw about 4000 semaphores total. The database will > >just allocate as many as it can into a single array and keep creating > >arrays until it has all it needs. > > > What happens if SEMMSL is reduced (first entry in /proc/sys/kernel/sem)?
Performance improves slightly but the ipc lock is still at the top of the profile ;)
-chris
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